linux-kernel - Re: [PATCH v2 07/12] mm: thp: check pmd migration entry in common path

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Message-Id: <5824317E.5050706@linux.vnet.ibm.com>
Date:   Thu, 10 Nov 2016 14:06:14 +0530
From:   Anshuman Khandual <khandual@...ux.vnet.ibm.com>
To:     Naoya Horiguchi <n-horiguchi@...jp.nec.com>, linux-mm@...ck.org
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Pavel Emelyanov <xemul@...allels.com>,
        Zi Yan <zi.yan@...rutgers.edu>,
        Balbir Singh <bsingharora@...il.com>,
        linux-kernel@...r.kernel.org,
        Naoya Horiguchi <nao.horiguchi@...il.com>
Subject: Re: [PATCH v2 07/12] mm: thp: check pmd migration entry in common
 path

On 11/08/2016 05:01 AM, Naoya Horiguchi wrote:
> If one of callers of page migration starts to handle thp, memory management code
> start to see pmd migration entry, so we need to prepare for it before enabling.
> This patch changes various code point which checks the status of given pmds in
> order to prevent race between thp migration and the pmd-related works.

There are lot of changes in this one patch. Should not we split
this up into multiple patches and explain them in a bit detail
through their commit messages ?